Hi!
I was searching for a while for a solution to my problem and tun/tap might be this solution. I have to admit that I haven't worked with it yet. Here is what I am looking for: We have an OpenVPN network (which already uses a TAP driver). Within this network, we have several clients, let’s say addresses from 192.168.0.1 to 192.168.0.255. These clients try to access ip addresses e.g. 192.168.1.1 to 192.168.1.255. The problem is, that the latter addresses are purely virtual. We want to create the "illusion" that there are real devices that for example answer to SNMP requests. Physically, there is only one server in this network segment. I think, the TUN/TAP driver can be configured to accept all requests on specified ip addresses and deliver them unchanged (no forwarding by replacing the IP address etc.) to the operating system. On this system, e.g. a Java ServerSocket waits on a port on an anycast address to accept all local ip addresses. I've tested it by simply adding ip addresses to an existing physical NIC. Now, the question is, 1.) is it possible to configure the tun/tap driver to do this, i.e. representing multiple IP addresses that can be used in the application layer? 2.) If yes, could you give an example how to do this (if its very easy) or point me to the part of the documentation? 3.) Would you recommend a configuration file or can this be changed dynamically? Moreover, 4.) is it possible to set wildcards for IP segments like 192.168.1.* instead of adding ip addresses one by one? This is important and leads to the next question: 5.) Is it possible to have something like e.g. 10,000 IP addresses connected to a single TUN/TAP driver? Will this require a lot of performance or is simply an entry in a table and respectively a lookup in this table for every incoming packet? Thank you very much! Any comments are appreciated! Jan
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